Quote:
Originally Posted by lordhelemt
It's not leaking. It is flowing when on the on position when the bike is not running. Yes, I replaced the diaphragm and spring but I'll stretch to the spring and see if it helps.
The reason I thought it was the gasket in the pic I showed isn't that how the on/prime switch is valved? In other words, if in the on position the gas flows through the vacuum diaphragm? In the prime position it bypasses the vacuum switch?
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Yes, dial does flow selection. In PRI flow bypasses diaphragm completely.
In ON, flow goes to diaphragm port 1st, and is blocked by it. Vacuum then pulls plunger away from seat. If fuel is flowing in ON without vacuum, then diaphragm plunger isn't sealing. Inspect the seating surface very closely. Test push the plunger onto seat and verify it seals all around.
Might also want to try ducatiman's softer O-ring idea.